A statement from Austin Bridge & Road says someone "with a questionable sense of humor" accessed the password on the message board.

The company says its portable sign that was hacked has since been removed, since a permanent exit sign has now been installed, and locks have been added to the portable version.

No word yet on the culprits.

According to legend, "The British are coming!" was the warning shouted out by Paul Revere on his midnight ride in April 1775 to alert American patriots that British troops were moving out of Boston to arrest their leaders. The warnings delivered by Revere and other riders allowed the American militia to rally to repel the British in the first battles of the American Revolution.